docs: def as_dataframe(self, time_index=False, absolute_time=False):
          """
          Converts the TDMS file to a DataFrame
  
          :param time_index: Whether to include a time index for the dataframe.
          :param absolute_time: If time_index is true, whether the time index
              values are absolute times or relative to the start time.
          :return: The full TDMS file data.
          :rtype: pandas.DataFrame
          """
  
          import pandas as pd
  
          dataframe_dict = OrderedDict()
          for key, value in self.objects.items():
              if value.has_data:
                  index = value.time_track(absolute_time) if time_index else None
                  dataframe_dict[key] = pd.Series(data=value.data, index=index)
          return pd.DataFrame.from_dict(dataframe_dict)